DHT11 sensor with ESP8266/NodeMCU using Arduino IDE

In this tutorial i a telling to you How to use DHT11 sensor with ESP8266/NodeMCU using Arduino IDE. First i am telling to you about DHT11 and DHT22 temperature and humidity sensor and Difference between DHT11 and DHT22.

What is DHT11 and DHT22?

The DHT11 and DH22 are both temperature and humidity sensors, but what’s the difference between the two? Let’s go through the important differences, and how they may affect which one you choose for your next project. These sensors are very basic and slow, but are great for hobbyists who want to do some basic data logging. The DHT sensors are made of two parts, a capacitive humidity sensor and a thermistor. There is also a very basic chip inside that does some analog to digital conversion and spits out a digital signal with the temperature and humidity. The digital signal is fairly easy to read using any microcontroller.

DHT11 vs DHT22

We have two versions of the DHT sensor, they look a bit similar and have the same pinout, but have different characteristics. Here are the specs:

DHT11

Ultra low cost

3 to 5V power and I/O

2.5mA max current use during conversion (while requesting data)

Good for 20-80% humidity readings with 5% accuracy

Good for 0-50°C temperature readings ±2°C accuracy

No more than 1 Hz sampling rate (once every second)

Body size 15.5mm x 12mm x 5.5mm

4 pins with 0.1″ spacing

DHT22

Low cost

3 to 5V power and I/O

2.5mA max current use during conversion (while requesting data)

Good for 0-100% humidity readings with 2-5% accuracy

Good for -40 to 80°C temperature readings ±0.5°C accuracy

No more than 0.5 Hz sampling rate (once every 2 seconds)

Body size 15.1mm x 25mm x 7.7mm

4 pins with 0.1″ spacing

As you can see, the DHT22 is a little more accurate and good over a slightly larger range. Both use a single digital pin and are ‘sluggish’ in that you can’t query them more than once every second or two.

About Us

IoTbyHVM.OOO is an attempt to help the people by sharing the knowledge and ideas about Internet of things and other technology related articles and videos. IoTbyHVM.OOO provides articles related to Arduino, Raspberry Pi, use of all general purpose sensors, circuits, home automation, drones, smart TV, voice control TV , Micro Controller etc. for DIY (Do it Yourself) purpose.

If you want to help support me on my journey, consider sharing my articles, or Buy me a Coffee!

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.